Caroline Wozniacki, who began this year as Number one in the WTA rankings, is the group leader due to her high ranking in WTA.

Making it to the final and playing for her third title (after Seoul and Moscow) has ensured Wozniacki's return to the top 10 when the rankings are updated on Monday.

She will rise from No. 11 to No. 10, swapping with Marion Bartoli.

Petrova will also be trying for her third title of the year. During her previous four matches with Wozniacki, she has suffered defeats.

The tournament in Sofia featured eight tennis players, two of whom received a "wild card" - the best Bulgarian female tennis star Tsvetana Pironkova and RussianMaria Kirilenko, who is No. 15 in the rankings.

The 2012 WTATournament of Champions is a singles-only tennis tournament that is played on indoor hard courts in Sofia's Arena Armeec hall.

This is the fourth edition of the tournament and is part of the 2012 WTA Tour.

The 2012 edition is the first to be held in Sofia, having been relocated from Bali, where the tournament was held for the previous three years and called the Commonwealth Bank Tournament of Champions.

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